Device and method used for water electrolysis hydrogen production and CO2 methanation production of synthetic natural gas
A technology for synthesizing natural gas and electrolyzing water, applied in the direction of electrolysis process, electrolysis components, gas fuel, etc., can solve the problems of low energy conversion efficiency, complex process flow, limited application, etc., and achieve the goal of reducing preparation cost, pollution and energy The effect of loss
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[0028] Example 1
[0029] like Figure 1-3 As shown, a device for producing hydrogen by electrolysis of water and producing synthetic natural gas by methanation of CO2 includes a unit 3 for producing hydrogen by electrolysis, a carbon dioxide generating unit 5 and a methanation unit 6 .
[0030] The water outlet of the water tank 1 is connected with the electrolytic water hydrogen production unit 3 through the heat exchanger 2 through the pipeline, the electrolytic water hydrogen production unit 3 and the carbon dioxide generation unit 5 are respectively connected with the gas mixer 4, and the mixed gas outlet of the gas mixer 4 is connected through the pipeline. Connected to the methanation unit 6, the methanation unit 6 is sequentially connected to the heat exchanger 2 and the gas-liquid separation reactor 7, and the liquid outlet of the gas-liquid separation reactor 7 is connected to the water tank through a pipeline.
[0031] The electrolysis water hydrogen production uni...
Example Embodiment
[0041] Example 2
[0042] The device of this embodiment is as figure 1 shown.
[0043] The preparation steps are as follows:
[0044] A. After the water is pretreated by the water tank 1, it is processed by the heat exchanger 2 to become superheated water vapor and enters the electrolytic water hydrogen production device 31 in the electrolytic water hydrogen production unit 3. The obtained hydrogen enters the hydrogen purification device 32 and is purified. Enter gas mixer 4.
[0045] B. CO in the carbon source device 51 in the carbon dioxide generating unit 5 2 After entering the carbon dioxide purification device 52 for purification, it enters the gas mixer 4, and the CO 2 The gas volume ratio with hydrogen is 1:4-6, fully mixed with hydrogen and heated to 250-450 ° C, the mixed gas enters the catalytic reaction set 61 in the methanation unit 6 to obtain 275-375 ° C high temperature methane gas and high temperature water vapor.
[0046] C, high-temperature methane gas ...
Example Embodiment
[0050] Example 3
[0051] The device of this embodiment is as figure 2 shown.
[0052] The preparation steps are as follows:
[0053] A. After the water is pretreated in the water tank 1, it is processed by the heat exchanger 2 to become superheated steam and enters the electrolytic water hydrogen production device 31 in the electrolytic water hydrogen production unit 3, and is further processed by the steam treatment device 311 and mixed with a small amount of hydrogen. The gas after the steam treatment device enters the water electrolysis hydrogen production equipment 312 to carry out the water electrolysis hydrogen production reaction, the hydrogen produced by the reaction enters the hydrogen collection device 313, the oxygen produced by the reaction enters the oxygen collection device 314, and the waste gas produced by the reaction enters the waste gas collection device 315, The hydrogen in the hydrogen collection device 313 enters the hydrogen purification device 32 fo...
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